CVE-2023-32629

Public Exploit

Description

Local privilege escalation vulnerability in Ubuntu Kernels overlayfs ovl_copy_up_meta_inode_data skip permission checks when calling ovl_do_setxattr on Ubuntu kernels

Remediation

Workaround:

  • If not needed, disable the ability for unprivileged users to create namespaces. To do this temporarily, do: sudo sysctl -w kernel.unprivileged_userns_clone=0 To disable across reboots, do: echo kernel.unprivileged_userns_clone=0 | \ sudo tee /etc/sysctl.d/99-disable-unpriv-userns.conf

Category

7.8
CVSS
Severity: High
CVSS 3.1 •
EPSS 58.81% Top 5%
Vendor Advisory ubuntu.com
Affected: Canonical Ubuntu Kernel
Published at:
Updated at:

References

Link Tags
https://ubuntu.com/security/notices/USN-6250-1 vendor advisory
https://lists.ubuntu.com/archives/kernel-team/2023-July/140920.html patch mailing list
https://wiz.io/blog/ubuntu-overlayfs-vulnerability exploit technical description
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-32629 third party advisory issue tracking
http://packetstormsecurity.com/files/174577/Kernel-Live-Patch-Security-Notice-LSN-0097-1.html

Frequently Asked Questions

What is the severity of CVE-2023-32629?
CVE-2023-32629 has been scored as a high severity vulnerability.
How to fix CVE-2023-32629?
As a workaround for remediating CVE-2023-32629: If not needed, disable the ability for unprivileged users to create namespaces. To do this temporarily, do: sudo sysctl -w kernel.unprivileged_userns_clone=0 To disable across reboots, do: echo kernel.unprivileged_userns_clone=0 | \ sudo tee /etc/sysctl.d/99-disable-unpriv-userns.conf
Is CVE-2023-32629 being actively exploited in the wild?
It is possible that CVE-2023-32629 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~59% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-32629?
CVE-2023-32629 affects Canonical Ubuntu Kernel.
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